mirror of https://github.com/Chocobozzz/PeerTube
423 lines
13 KiB
TypeScript
423 lines
13 KiB
TypeScript
import * as ffmpeg from 'fluent-ffmpeg'
|
|
import { dirname, join } from 'path'
|
|
import { getTargetBitrate, VideoResolution } from '../../shared/models/videos'
|
|
import { FFMPEG_NICE, VIDEO_TRANSCODING_FPS } from '../initializers/constants'
|
|
import { processImage } from './image-utils'
|
|
import { logger } from './logger'
|
|
import { checkFFmpegEncoders } from '../initializers/checker-before-init'
|
|
import { readFile, remove, writeFile } from 'fs-extra'
|
|
import { CONFIG } from '../initializers/config'
|
|
|
|
function computeResolutionsToTranscode (videoFileHeight: number) {
|
|
const resolutionsEnabled: number[] = []
|
|
const configResolutions = CONFIG.TRANSCODING.RESOLUTIONS
|
|
|
|
// Put in the order we want to proceed jobs
|
|
const resolutions = [
|
|
VideoResolution.H_480P,
|
|
VideoResolution.H_360P,
|
|
VideoResolution.H_720P,
|
|
VideoResolution.H_240P,
|
|
VideoResolution.H_1080P
|
|
]
|
|
|
|
for (const resolution of resolutions) {
|
|
if (configResolutions[ resolution + 'p' ] === true && videoFileHeight > resolution) {
|
|
resolutionsEnabled.push(resolution)
|
|
}
|
|
}
|
|
|
|
return resolutionsEnabled
|
|
}
|
|
|
|
async function getVideoFileSize (path: string) {
|
|
const videoStream = await getVideoFileStream(path)
|
|
|
|
return {
|
|
width: videoStream.width,
|
|
height: videoStream.height
|
|
}
|
|
}
|
|
|
|
async function getVideoFileResolution (path: string) {
|
|
const size = await getVideoFileSize(path)
|
|
|
|
return {
|
|
videoFileResolution: Math.min(size.height, size.width),
|
|
isPortraitMode: size.height > size.width
|
|
}
|
|
}
|
|
|
|
async function getVideoFileFPS (path: string) {
|
|
const videoStream = await getVideoFileStream(path)
|
|
|
|
for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) {
|
|
const valuesText: string = videoStream[key]
|
|
if (!valuesText) continue
|
|
|
|
const [ frames, seconds ] = valuesText.split('/')
|
|
if (!frames || !seconds) continue
|
|
|
|
const result = parseInt(frames, 10) / parseInt(seconds, 10)
|
|
if (result > 0) return Math.round(result)
|
|
}
|
|
|
|
return 0
|
|
}
|
|
|
|
async function getVideoFileBitrate (path: string) {
|
|
return new Promise<number>((res, rej) => {
|
|
ffmpeg.ffprobe(path, (err, metadata) => {
|
|
if (err) return rej(err)
|
|
|
|
return res(metadata.format.bit_rate)
|
|
})
|
|
})
|
|
}
|
|
|
|
function getDurationFromVideoFile (path: string) {
|
|
return new Promise<number>((res, rej) => {
|
|
ffmpeg.ffprobe(path, (err, metadata) => {
|
|
if (err) return rej(err)
|
|
|
|
return res(Math.floor(metadata.format.duration))
|
|
})
|
|
})
|
|
}
|
|
|
|
async function generateImageFromVideoFile (fromPath: string, folder: string, imageName: string, size: { width: number, height: number }) {
|
|
const pendingImageName = 'pending-' + imageName
|
|
|
|
const options = {
|
|
filename: pendingImageName,
|
|
count: 1,
|
|
folder
|
|
}
|
|
|
|
const pendingImagePath = join(folder, pendingImageName)
|
|
|
|
try {
|
|
await new Promise<string>((res, rej) => {
|
|
ffmpeg(fromPath, { niceness: FFMPEG_NICE.THUMBNAIL })
|
|
.on('error', rej)
|
|
.on('end', () => res(imageName))
|
|
.thumbnail(options)
|
|
})
|
|
|
|
const destination = join(folder, imageName)
|
|
await processImage(pendingImagePath, destination, size)
|
|
} catch (err) {
|
|
logger.error('Cannot generate image from video %s.', fromPath, { err })
|
|
|
|
try {
|
|
await remove(pendingImagePath)
|
|
} catch (err) {
|
|
logger.debug('Cannot remove pending image path after generation error.', { err })
|
|
}
|
|
}
|
|
}
|
|
|
|
type TranscodeOptions = {
|
|
inputPath: string
|
|
outputPath: string
|
|
resolution: VideoResolution
|
|
isPortraitMode?: boolean
|
|
|
|
hlsPlaylist?: {
|
|
videoFilename: string
|
|
}
|
|
}
|
|
|
|
function transcode (options: TranscodeOptions) {
|
|
return new Promise<void>(async (res, rej) => {
|
|
try {
|
|
let command = ffmpeg(options.inputPath, { niceness: FFMPEG_NICE.TRANSCODING })
|
|
.output(options.outputPath)
|
|
|
|
if (options.hlsPlaylist) {
|
|
command = await buildHLSCommand(command, options)
|
|
} else {
|
|
command = await buildx264Command(command, options)
|
|
}
|
|
|
|
if (CONFIG.TRANSCODING.THREADS > 0) {
|
|
// if we don't set any threads ffmpeg will chose automatically
|
|
command = command.outputOption('-threads ' + CONFIG.TRANSCODING.THREADS)
|
|
}
|
|
|
|
command
|
|
.on('error', (err, stdout, stderr) => {
|
|
logger.error('Error in transcoding job.', { stdout, stderr })
|
|
return rej(err)
|
|
})
|
|
.on('end', () => {
|
|
return onTranscodingSuccess(options)
|
|
.then(() => res())
|
|
.catch(err => rej(err))
|
|
})
|
|
.run()
|
|
} catch (err) {
|
|
return rej(err)
|
|
}
|
|
})
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
export {
|
|
getVideoFileSize,
|
|
getVideoFileResolution,
|
|
getDurationFromVideoFile,
|
|
generateImageFromVideoFile,
|
|
transcode,
|
|
getVideoFileFPS,
|
|
computeResolutionsToTranscode,
|
|
audio,
|
|
getVideoFileBitrate
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
|
|
async function buildx264Command (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) {
|
|
let fps = await getVideoFileFPS(options.inputPath)
|
|
// On small/medium resolutions, limit FPS
|
|
if (
|
|
options.resolution !== undefined &&
|
|
options.resolution < VIDEO_TRANSCODING_FPS.KEEP_ORIGIN_FPS_RESOLUTION_MIN &&
|
|
fps > VIDEO_TRANSCODING_FPS.AVERAGE
|
|
) {
|
|
fps = VIDEO_TRANSCODING_FPS.AVERAGE
|
|
}
|
|
|
|
command = await presetH264(command, options.resolution, fps)
|
|
|
|
if (options.resolution !== undefined) {
|
|
// '?x720' or '720x?' for example
|
|
const size = options.isPortraitMode === true ? `${options.resolution}x?` : `?x${options.resolution}`
|
|
command = command.size(size)
|
|
}
|
|
|
|
if (fps) {
|
|
// Hard FPS limits
|
|
if (fps > VIDEO_TRANSCODING_FPS.MAX) fps = VIDEO_TRANSCODING_FPS.MAX
|
|
else if (fps < VIDEO_TRANSCODING_FPS.MIN) fps = VIDEO_TRANSCODING_FPS.MIN
|
|
|
|
command = command.withFPS(fps)
|
|
}
|
|
|
|
return command
|
|
}
|
|
|
|
async function buildHLSCommand (command: ffmpeg.FfmpegCommand, options: TranscodeOptions) {
|
|
const videoPath = getHLSVideoPath(options)
|
|
|
|
command = await presetCopy(command)
|
|
|
|
command = command.outputOption('-hls_time 4')
|
|
.outputOption('-hls_list_size 0')
|
|
.outputOption('-hls_playlist_type vod')
|
|
.outputOption('-hls_segment_filename ' + videoPath)
|
|
.outputOption('-hls_segment_type fmp4')
|
|
.outputOption('-f hls')
|
|
.outputOption('-hls_flags single_file')
|
|
|
|
return command
|
|
}
|
|
|
|
function getHLSVideoPath (options: TranscodeOptions) {
|
|
return `${dirname(options.outputPath)}/${options.hlsPlaylist.videoFilename}`
|
|
}
|
|
|
|
async function onTranscodingSuccess (options: TranscodeOptions) {
|
|
if (!options.hlsPlaylist) return
|
|
|
|
// Fix wrong mapping with some ffmpeg versions
|
|
const fileContent = await readFile(options.outputPath)
|
|
|
|
const videoFileName = options.hlsPlaylist.videoFilename
|
|
const videoFilePath = getHLSVideoPath(options)
|
|
|
|
const newContent = fileContent.toString()
|
|
.replace(`#EXT-X-MAP:URI="${videoFilePath}",`, `#EXT-X-MAP:URI="${videoFileName}",`)
|
|
|
|
await writeFile(options.outputPath, newContent)
|
|
}
|
|
|
|
function getVideoFileStream (path: string) {
|
|
return new Promise<any>((res, rej) => {
|
|
ffmpeg.ffprobe(path, (err, metadata) => {
|
|
if (err) return rej(err)
|
|
|
|
const videoStream = metadata.streams.find(s => s.codec_type === 'video')
|
|
if (!videoStream) return rej(new Error('Cannot find video stream of ' + path))
|
|
|
|
return res(videoStream)
|
|
})
|
|
})
|
|
}
|
|
|
|
/**
|
|
* A slightly customised version of the 'veryfast' x264 preset
|
|
*
|
|
* The veryfast preset is right in the sweet spot of performance
|
|
* and quality. Superfast and ultrafast will give you better
|
|
* performance, but then quality is noticeably worse.
|
|
*/
|
|
async function presetH264VeryFast (command: ffmpeg.FfmpegCommand, resolution: VideoResolution, fps: number): Promise<ffmpeg.FfmpegCommand> {
|
|
let localCommand = await presetH264(command, resolution, fps)
|
|
localCommand = localCommand.outputOption('-preset:v veryfast')
|
|
.outputOption([ '--aq-mode=2', '--aq-strength=1.3' ])
|
|
/*
|
|
MAIN reference: https://slhck.info/video/2017/03/01/rate-control.html
|
|
Our target situation is closer to a livestream than a stream,
|
|
since we want to reduce as much a possible the encoding burden,
|
|
altough not to the point of a livestream where there is a hard
|
|
constraint on the frames per second to be encoded.
|
|
|
|
why '--aq-mode=2 --aq-strength=1.3' instead of '-profile:v main'?
|
|
Make up for most of the loss of grain and macroblocking
|
|
with less computing power.
|
|
*/
|
|
|
|
return localCommand
|
|
}
|
|
|
|
/**
|
|
* A preset optimised for a stillimage audio video
|
|
*/
|
|
async function presetStillImageWithAudio (
|
|
command: ffmpeg.FfmpegCommand,
|
|
resolution: VideoResolution,
|
|
fps: number
|
|
): Promise<ffmpeg.FfmpegCommand> {
|
|
let localCommand = await presetH264VeryFast(command, resolution, fps)
|
|
localCommand = localCommand.outputOption('-tune stillimage')
|
|
|
|
return localCommand
|
|
}
|
|
|
|
/**
|
|
* A toolbox to play with audio
|
|
*/
|
|
namespace audio {
|
|
export const get = (option: ffmpeg.FfmpegCommand | string) => {
|
|
// without position, ffprobe considers the last input only
|
|
// we make it consider the first input only
|
|
// if you pass a file path to pos, then ffprobe acts on that file directly
|
|
return new Promise<{ absolutePath: string, audioStream?: any }>((res, rej) => {
|
|
|
|
function parseFfprobe (err: any, data: ffmpeg.FfprobeData) {
|
|
if (err) return rej(err)
|
|
|
|
if ('streams' in data) {
|
|
const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio')
|
|
if (audioStream) {
|
|
return res({
|
|
absolutePath: data.format.filename,
|
|
audioStream
|
|
})
|
|
}
|
|
}
|
|
|
|
return res({ absolutePath: data.format.filename })
|
|
}
|
|
|
|
if (typeof option === 'string') {
|
|
return ffmpeg.ffprobe(option, parseFfprobe)
|
|
}
|
|
|
|
return option.ffprobe(parseFfprobe)
|
|
})
|
|
}
|
|
|
|
export namespace bitrate {
|
|
const baseKbitrate = 384
|
|
|
|
const toBits = (kbits: number): number => { return kbits * 8000 }
|
|
|
|
export const aac = (bitrate: number): number => {
|
|
switch (true) {
|
|
case bitrate > toBits(baseKbitrate):
|
|
return baseKbitrate
|
|
default:
|
|
return -1 // we interpret it as a signal to copy the audio stream as is
|
|
}
|
|
}
|
|
|
|
export const mp3 = (bitrate: number): number => {
|
|
/*
|
|
a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac.
|
|
That's why, when using aac, we can go to lower kbit/sec. The equivalences
|
|
made here are not made to be accurate, especially with good mp3 encoders.
|
|
*/
|
|
switch (true) {
|
|
case bitrate <= toBits(192):
|
|
return 128
|
|
case bitrate <= toBits(384):
|
|
return 256
|
|
default:
|
|
return baseKbitrate
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Standard profile, with variable bitrate audio and faststart.
|
|
*
|
|
* As for the audio, quality '5' is the highest and ensures 96-112kbps/channel
|
|
* See https://trac.ffmpeg.org/wiki/Encode/AAC#fdk_vbr
|
|
*/
|
|
async function presetH264 (command: ffmpeg.FfmpegCommand, resolution: VideoResolution, fps: number): Promise<ffmpeg.FfmpegCommand> {
|
|
let localCommand = command
|
|
.format('mp4')
|
|
.videoCodec('libx264')
|
|
.outputOption('-level 3.1') // 3.1 is the minimal ressource allocation for our highest supported resolution
|
|
.outputOption('-b_strategy 1') // NOTE: b-strategy 1 - heuristic algorythm, 16 is optimal B-frames for it
|
|
.outputOption('-bf 16') // NOTE: Why 16: https://github.com/Chocobozzz/PeerTube/pull/774. b-strategy 2 -> B-frames<16
|
|
.outputOption('-pix_fmt yuv420p') // allows import of source material with incompatible pixel formats (e.g. MJPEG video)
|
|
.outputOption('-map_metadata -1') // strip all metadata
|
|
.outputOption('-movflags faststart')
|
|
|
|
const parsedAudio = await audio.get(localCommand)
|
|
|
|
if (!parsedAudio.audioStream) {
|
|
localCommand = localCommand.noAudio()
|
|
} else if ((await checkFFmpegEncoders()).get('libfdk_aac')) { // we favor VBR, if a good AAC encoder is available
|
|
localCommand = localCommand
|
|
.audioCodec('libfdk_aac')
|
|
.audioQuality(5)
|
|
} else {
|
|
// we try to reduce the ceiling bitrate by making rough correspondances of bitrates
|
|
// of course this is far from perfect, but it might save some space in the end
|
|
const audioCodecName = parsedAudio.audioStream[ 'codec_name' ]
|
|
let bitrate: number
|
|
if (audio.bitrate[ audioCodecName ]) {
|
|
localCommand = localCommand.audioCodec('aac')
|
|
|
|
bitrate = audio.bitrate[ audioCodecName ](parsedAudio.audioStream[ 'bit_rate' ])
|
|
if (bitrate !== undefined && bitrate !== -1) localCommand = localCommand.audioBitrate(bitrate)
|
|
}
|
|
}
|
|
|
|
// Constrained Encoding (VBV)
|
|
// https://slhck.info/video/2017/03/01/rate-control.html
|
|
// https://trac.ffmpeg.org/wiki/Limiting%20the%20output%20bitrate
|
|
const targetBitrate = getTargetBitrate(resolution, fps, VIDEO_TRANSCODING_FPS)
|
|
localCommand = localCommand.outputOptions([`-maxrate ${ targetBitrate }`, `-bufsize ${ targetBitrate * 2 }`])
|
|
|
|
// Keyframe interval of 2 seconds for faster seeking and resolution switching.
|
|
// https://streaminglearningcenter.com/blogs/whats-the-right-keyframe-interval.html
|
|
// https://superuser.com/a/908325
|
|
localCommand = localCommand.outputOption(`-g ${ fps * 2 }`)
|
|
|
|
return localCommand
|
|
}
|
|
|
|
async function presetCopy (command: ffmpeg.FfmpegCommand): Promise<ffmpeg.FfmpegCommand> {
|
|
return command
|
|
.format('mp4')
|
|
.videoCodec('copy')
|
|
.audioCodec('copy')
|
|
}
|